I was thinking about this recently. I thought about shaping my own truss rod cover. I'm in the process of making a custom pick guard for a strat style guitar, although it will have to be more fiddley than that, has to be worth a try..?

As Paladin says' just use the original screws.......... and to be honest' they look a lot better than the gibson one's supplied! (smaller)
But yeah' the holes line up exactly. _________________For those about to ROCK!!!!

That's great if you can fit Gibson truss rod covers to modern Tokais, I read that the vintage ones where the same height, but at some point they changed it.. According to someone on ebay selling Les Paul TRCs, a Gibson cover is 6 cm from end to end, and 5.2 cm from hole to hole. I'll have to check the hole to hole dimentions of my tokai when I get home, but if anyone has the information to hand that'd be cools.